[clang] [llvm] [clang] Implement P3733R1 (PR #203944)

[Aaron Ballman via cfe-commits]

================
@@ -214,11 +214,11 @@ int \N{Λ} = 0;
 // expected-error at -2 {{expected unqualified-id}}
 const char* emoji = "\N{🤡}";
 // expected-error at -1 {{'🤡' is not a valid Unicode character name}}
-//   expected-note at -2 {{did you mean OX ('🐂' U+1F402)?}}
-//   expected-note at -3 {{did you mean ANT ('🐜' U+1F41C)?}}
-//   expected-note at -4 {{did you mean ARC ('⌒' U+2312)?}}
-//   expected-note at -5 {{did you mean AXE ('🪓' U+1FA93)?}}
-//   expected-note at -6 {{did you mean BAT ('🦇' U+1F987)?}}
+//   expected-note at -2 {{did you mean BS (U+0008)?}}
+//   expected-note at -3 {{did you mean CR (U+000D)?}}
+//   expected-note at -4 {{did you mean EM (U+0019)?}}
+//   expected-note at -5 {{did you mean FF (U+000C)?}}
+//   expected-note at -6 {{did you mean FS (U+001C)?}}
----------------
AaronBallman wrote:

Huh, also, are these suggestions actually valid?
```
 expected-note at -2 {{did you mean BS (U+0008)?}}
```
In what universe would the user have meant "backspace"?

https://github.com/llvm/llvm-project/pull/203944